Long Beach officials declared success Friday after a month-long amnesty program for overdue library books.

More than 4,000 patrons returned 13,323 items worth an estimated $240,000, according to a statement from the city.

“Our Library Amnesty Program was a huge success, and I’m thankful that we not only got back a ton of books, but that people who were struggling had an opportunity to renew their library privileges,” Mayor Robert Garcia said in a statement.

Glenda Williams, the city’s director of library services, said the oldest books were returned by two people and were overdue since September 1997. The titles included four books from Sue Grafton’s Kinsey Millhone series — “A” Is for Alibi, “C” Is for Corpse, “D” Is for Deadbeat and “E” Is for Evidence — as well as a book about the U.S. Civil War and a watch repair manual, Williams said.

Patrons with unpaid overdue fines for materials they had previously returned had their fines waived by donating new books, and 2,911 were donated. The total amount of overdue fines waived for 4,055 patrons was $71,265.

Councilman Roberto Uranga, who introduced the item allowing amnesty to the City Council, said he hopes to make the program annual.